Question: What are the series ordinal for hydrazine whose ionization energy is 8.93?
Paraphrase: If hydrazine's ionization energy is 8.93, what is the series ordinal?
SPARQL (Wikidata): SELECT ?value WHERE { wd:Q58447 p:P2260 ?s . ?s ps:P2260 ?x filter(contains(?x , '8.93')) . ?s pq:P1545 ?value}